He was originally due to direct, co-write, and star in his own "Batman" movie but has now confessed he left the project as he felt he would struggle to do the iconic comic book character justice.

"I tried to direct a version of ('Batman'), (I) worked with a really good screenwriter, but kinda just couldn't come up with a version," Ben told U.S. late night host Jimmy Kimmel. "Couldn't crack it."

The 46-year-old was thought to be co-writing the movie, provisionally titled "The Batman", with "Cloverfield" filmmaker Matt Reeves, who is still involved with the project. The actor wished Matt well on Twitter following his announced departure and again offered his good wishes when speaking to Jimmy.

"I thought it was time for someone else to take a shot at it," he explained. "And they've got some really good people."

To mark the end of the star's time as the Dark Knight, the chat show host had his assistant Guillermo Rodriguez dress as Batman's sidekick Robin and officially retire Ben's Batsuit, which bore the legend 'Batfleck' and the number 12 (in honour of American football star Tom Brady) on the back, by hoisting it into his studio rafters.